Interview Prep 2026
Crack the JavaScript interview — no fluff
41 JavaScript
Interview
Questions
The most frequently asked JavaScript questions in 2026 interviews — closures, async/await, prototypes, event loop, performance, and DOM. Curated from real interviews at top companies.
"JavaScript interviews don't test if you've used it — they test if you understand it. Know your
event loop, know your closures, know your async patterns."
— The Boring Education Team
41
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Core topics
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2026
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41 JavaScript Interview Questions · 2026
02
Top 10 Must-Know Questions
JavaScript Core, Async & Patterns
01.
What is the difference between
var, let, and const in JavaScript?
02.
Explain how the JavaScript event loop works with an example.
03.
What are closures in JavaScript? Give a practical use case.
04.
How does prototypal inheritance work in JavaScript?
05.
What are higher-order functions? Write a function that accepts another function as an argument.
06.
Describe the concept of
this in JavaScript. How does it behave in different contexts?
07.
What are JavaScript Promises? Explain how to create and use them.
08.
What are
async/await functions? How do they improve readability of async code?
09.
What is the purpose of
bind, call, and apply? Provide examples.
10.
Explain hoisting in JavaScript. How does it affect variable and function declarations?
Get all 41 questions with full answers. The complete list covers async patterns,
DOM manipulation, performance optimization, ES6+ features, design patterns, CORS, service workers,
SPAs, and more — all with code examples and interview tips tailored for the Indian tech market.
All 41 Questions + Detailed Explanations 🚀
Code examples · Best practices · Common pitfalls · Interview tips · Real-world
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